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Metamorphic Rocks - Contact Metamorphism.
The high
temperatures needed to form metamorphic rock
may come about by contact of an
existing rock with an igneous
intrusion.
An igneous
intrusion happens when magma is forced
through a crack
in layers of rock in the Earth's
crust.
The rock intrusion which is seen
cutting across other rocks
must be younger (formed more recently).
Contact metamorphism is sometimes called baking.
Where the limestone has been in contact with magma
the high temperature has changed it into marble (shown as darker
blue).
The magma has slowly solidified to
become granite.
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